Changing the textual string of in an option widget causes issues

If you have a number of values in a option widget and you amend one of them say to correct a typo, and then go and visit a node that had that value selected it will no longer have any option assigned to it. The underlying content table is correct, the issue is that the node is reading values from cache. The solution seems to be to clear cache_content however I'm not certain where the best point to apply this in the update flow is or indeed if we want to selectively clear the cache.